Chronology is the science of locating events in time. An arrangement of events, from either earliest to latest or the reverse, is also called a chronology or, particularly when involving graphical elements, a timeline. See also Chronicle.
The familiar terms ‘era’ (taken as a system of numbered calendar years) and ‘calendar’ concern two complementary fundamental concepts of chronology. So during eight centuries the calendar belonging to the Christian era, which era was taken in use in the eighth century, was the Julian calendar, but after the year 1582 it was the Gregorian calendar. Dionysius Exiguus (about the year 500) was the founder.
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